# Base repository support
# Copyright (C) 2002-2007 John Goerzen
# <jgoerzen@complete.org>
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software
#    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA

import re
import os.path
import traceback
from offlineimap import CustomConfig
from offlineimap.ui import getglobalui

class BaseRepository(object, CustomConfig.ConfigHelperMixin):

    def __init__(self, reposname, account):
        self.ui = getglobalui()
        self.account = account
        self.config = account.getconfig()
        self.name = reposname
        self.localeval = account.getlocaleval()
        self._accountname = self.account.getname()
        self.uiddir = os.path.join(self.config.getmetadatadir(), 'Repository-' + self.name)
        if not os.path.exists(self.uiddir):
            os.mkdir(self.uiddir, 0700)
        self.mapdir = os.path.join(self.uiddir, 'UIDMapping')
        if not os.path.exists(self.mapdir):
            os.mkdir(self.mapdir, 0700)
        self.uiddir = os.path.join(self.uiddir, 'FolderValidity')
        if not os.path.exists(self.uiddir):
            os.mkdir(self.uiddir, 0700)

        self.nametrans = lambda foldername: foldername
        self.folderfilter = lambda foldername: 1
        self.folderincludes = []
        self.foldersort = cmp
        if self.config.has_option(self.getsection(), 'nametrans'):
            self.nametrans = self.localeval.eval(
                self.getconf('nametrans'), {'re': re})
        if self.config.has_option(self.getsection(), 'folderfilter'):
            self.folderfilter = self.localeval.eval(
                self.getconf('folderfilter'), {'re': re})
        if self.config.has_option(self.getsection(), 'folderincludes'):
            self.folderincludes = self.localeval.eval(
                self.getconf('folderincludes'), {'re': re})
        if self.config.has_option(self.getsection(), 'foldersort'):
            self.foldersort = self.localeval.eval(
                self.getconf('foldersort'), {'re': re})

    def restore_atime(self):
        """Sets folders' atime back to their values after a sync

        Controlled by the 'restoreatime' config parameter (default
        False), applies only to local Maildir mailboxes and does nothing
        on all other repository types."""
        pass

    def connect(self):
        """Establish a connection to the remote, if necessary.  This exists
        so that IMAP connections can all be established up front, gathering
        passwords as needed.  It was added in order to support the
        error recovery -- we need to connect first outside of the error
        trap in order to validate the password, and that's the point of
        this function."""
        pass

    def holdordropconnections(self):
        pass

    def dropconnections(self):
        pass

    def getaccount(self):
        return self.account

    def getname(self):
        return self.name

    def __str__(self):
        return self.name

    @property
    def accountname(self):
        """Account name as string"""
        return self._accountname

    def getuiddir(self):
        return self.uiddir

    def getmapdir(self):
        return self.mapdir

    def getsection(self):
        return 'Repository ' + self.name

    def getconfig(self):
        return self.config

    def getlocaleval(self):
        return self.account.getlocaleval()
    
    def getfolders(self):
        """Returns a list of ALL folders on this server."""
        return []

    def forgetfolders(self):
        """Forgets the cached list of folders, if any.  Useful to run
        after a sync run."""
        pass

    def getsep(self):
        raise NotImplementedError

    def makefolder(self, foldername):
        raise NotImplementedError

    def deletefolder(self, foldername):
        raise NotImplementedError

    def getfolder(self, foldername):
        raise NotImplementedError
    
    def syncfoldersto(self, dst_repo, status_repo):
        """Syncs the folders in this repository to those in dest.

        It does NOT sync the contents of those folders."""
        src_repo = self
        src_folders = src_repo.getfolders()
        dst_folders = dst_repo.getfolders()

        # Create hashes with the names, but convert the source folders
        # to the dest folder's sep.
        src_hash = {}
        for folder in src_folders:
            src_hash[folder.getvisiblename().replace(
                    src_repo.getsep(), dst_repo.getsep())] = folder
        dst_hash = {}
        for folder in dst_folders:
            dst_hash[folder.getvisiblename()] = folder

        #
        # Find new folders.
        for key in src_hash.keys():
            if not key in dst_hash:
                try:
                    dst_repo.makefolder(key)
                    status_repo.makefolder(key.replace(dst_repo.getsep(),
                                                      status_repo.getsep()))
                except (KeyboardInterrupt):
                    raise
                except:
                    self.ui.warn("ERROR Attempting to create folder " \
                        + key + ":"  +traceback.format_exc())

        #
        # Find deleted folders.
        #
        # We don't delete folders right now.

        #for key in desthash.keys():
        #    if not key in srchash:
        #        dest.deletefolder(key)
        
    ##### Keepalive

    def startkeepalive(self):
        """The default implementation will do nothing."""
        pass

    def stopkeepalive(self):
        """Stop keep alive, but don't bother waiting
        for the threads to terminate."""
        pass